My microphone works perfectly and my voice is like chocolate rain in your ears. I have literally had virtual panties thrown at me through email. I can hear my voice in Steam's main voice settings area *but* cannot get my microphone to work in the beta.

My microphone overall works in 99% of all known applications in the known universe and I can use my microphone in virtually every other application but in L4D2 beta.

I'm on Kubuntu 13.04 (KDE version) and though everything is good about the game (except for some microstuttering) the voice thing is killing me.